US 7388551 B2
In some embodiments, the multiple antennas are cooperated in the system to provide simultaneous communication with multiple remote sites. Embodiments comprises a first variable inclined continuous transverse stub (VICTS) antenna that comprises a perimeter and an inactive region within the perimeter, a second VICTS antenna positioned at the inactive region of the first antenna, a first antenna control that steers the first antenna, and a second antenna control that steers the second antenna independent of the first antenna. In some embodiment, an antenna system is provided that comprises a first turntable having a perimeter, a first antenna having a perimeter, where the first antenna is secured on a first surface of the first turntable, a second antenna positioned proximate the first antenna and extending within the perimeter of the first turntable, where the second antenna is steerable independent of the first antenna.
1. An antenna comprising:
a first variable inclined continuous transverse stub (VICTS) antenna comprising a perimeter and an inactive region defined within the perimeter; and
a second VICTS antenna positioned at the inactive region within the perimeter of the first VICTS antenna, wherein the second VICTS antenna is steerable independent of the first VICTS antenna.
2. The antenna of
3. The antenna of
4. The antenna of
5. The antenna of
6. The antenna of
7. The antenna of
a third VICTS antenna comprising a perimeter and an inactive region defined within the perimeter of the third antenna such that the first antenna is positioned at the inactive region of the third antenna.
8. The antenna of
9. A method, comprising:
steering a first variable inclined continuous transverse stub (VICTS) antenna in response to receiving a first control signal, the VICTS antenna comprising a perimeter and an inactive region defined within the perimeter; and
steering a second VICTS antenna in response to receiving a second control signal, the second VICTS antenna being positioned at the inactive region within the perimeter of the first VICTS antenna.
10. The method of
11. The method of
12. The method of
13. The method of
14. The method of
15. The method of
16. A method, comprising:
providing a first turntable having a perimeter;
securing a first antenna having a perimeter on a first surface of the first turntable; and
positioning a second antenna comprising a second turntable at a location proximate the first antenna such that at least a portion of the second antenna is positioned to extend within the perimeter of the first turntable, wherein the second antenna is steerable independent of the first antenna.
17. The method of
18. The method of
19. The system of
providing a first rotational drive coupled with the second turntable to adjust rotational positioning of the second antenna;
providing a second rotational drive coupled with the second antenna to adjust a first characteristic of the second antenna;
providing a third rotational drive coupled with the first turntable to adjust the positioning of the first turntable; and
providing a fourth rotational drive coupled with the first antenna to adjust a first characteristic of the first antenna.
20. The method of
providing a fifth rotational drive coupled with the first antenna to adjust a polarization of the first antenna;
providing a sixth rotational drive coupled with the second antenna to adjust a polarization of the second antenna; and
wherein the first characteristic of the first antenna comprises an elevation at which that first antenna is directed such that the fourth rotational drive adjusts the elevation of the first antenna, and the first characteristic of the second antenna comprises an elevation at which that second antenna is directed such that the second rotational drive adjusts the elevation of the second antenna.
This application is a continuation of U.S. patent application Ser. No. 10/900,020 filed on Jul. 26, 2004, now U.S. Pat. No. 7,068,235, of John Guidon et al., for ANTENNA SYSTEM, which application is hereby fully incorporated herein by reference.
The present application is directed generally toward wireless communication with antennas, and more specifically steerable antennas.
The use of and number of desired implementations for wireless communication is greatly expanding. To actually implement many implementations, complex, expensive and cumbersome antenna systems have to be utilized. Further, the available wireless communications can be limited because of the antenna.
Directional antennas are utilized in many applications and are often capable of being pointed, or ‘steered’ in a desired direction. There are many types and variations of directional antennas, including phased array, mechanically steerable, turntable mounted tiltable and non-tiltable flat plate, turntable mounted Lumberg lens, and other such antennas. These antennas each have many benefits. However, each of the identified antennas has limitations. For example, the utilization of these antennas for mobile communication can be complex and/or expensive. Additionally, some applications prevent the use of some of these antennas.
For example, the utilization of antennas on airplanes is often restricted because antennas needed to achieve desired implementations are excessively expensive and complex. Further, many antenna systems cannot be employed because of size restrictions and impracticality of operation.
The present embodiments advantageously address the needs above as well as other needs by providing systems, apparatuses and methods for use in providing wireless communication. In some embodiments, multiple antennas are cooperated in the system to provide simultaneous communication with multiple remote sites.
Some embodiments provide an antenna that comprises a first variable inclined continuous transverse stub (VICTS) antenna that comprises a perimeter and an inactive region defined within the perimeter, and a second VICTS antenna positioned at the inactive region within the perimeter of the first VICTS antenna. The antenna further includes a first antenna control that cooperates with the first VICTS antenna to steer the first VICTS antenna, and a second antenna control cooperated with the second VICTS antenna to steer the second VICTS antenna independent of the first VICTS antenna.
In some embodiments, an antenna system is provided that comprises a first turntable having a perimeter, a first antenna having a perimeter, where the first antenna is secured on a first surface of the first turntable, a second antenna comprising a second turntable, and the second antenna is positioned proximate the first antenna such that at least a portion of the first antenna is positioned to extend within the perimeter of the first turntable, where the second antenna is steerable independent of the first antenna.
The above and other aspects, features and advantages of the present embodiments will be more apparent from the following more particular description thereof, presented in conjunction with the following drawings wherein:
Corresponding reference characters indicate corresponding components throughout the several views of the drawings. Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments of the present invention.
The present embodiments provide systems, apparatuses and methods for wirelessly communicating information and/or data. In some embodiments, the antenna systems include a plurality of antennas providing wireless communication with different remote receivers. Further, some embodiments are constructed with low profiles so that they can be employed on moving vehicles with limited drag. For example, some preferred implementations provide antenna systems mounted on airplanes to allow simultaneous wireless communication with multiple, remote communication systems, such as satellites.
Directional antennas provide many useful properties including power gain, ability to reject unwanted signals from unwanted directions, and can be employed with steerable applications in tracking either moving or stationary targets from either stationary or moving platforms. There are many types and variations of directional antennas, such as phased array, mechanically steerable, turntable mounted tiltable and non-tiltable flat panel, turntable mounted Lumberg lens, and other such antennas.
Phased array antennas have the benefit of being able to track multiple targets or produce multiple beams from a single antenna. These antennas, however, are typically expensive to manufacture due, at least in part, to the large numbers of expensive delay element components. Further, phased array antennas often have inferior gain performance per unit area due to losses within successive delay elements. The implementations of phased array antennas can also be limited because they are typically heavy and bulky.
There are many types of mechanically steerable antennas. Gimbal mounted parabolic antennas are one example. Typically, parabolic antennas are fairly large relative to the performance, and are generally spherically swept volumes and/or cubical in their physical dimensions. Although these antennas provide relatively good performance, the implementation is limited due to the size and/or shape. For example, their uses in portable or mobile applications are limited (e.g., antennas to be mounted on aircraft generally require a low profile in the vertical extent, to avoid aerodynamic issues). Further, single parabolic antennas have only single beam.
Turntable mounted tiltable flat plate antennas are vertically extended or extended in the elevation dimension because these antennas typically require a large flat plate to be tilted to adjust the elevation of their beam. They are also limited to a single beam. Turntable mounted non-tiltable flat plate antennas are less useful because they lack the capability to steer the beam in elevation. Turntable mounted Lumberg lens antenna configurations incorporate refractive devices of radiated refractive index. However, these devices are typically both time consuming to manufacture and install, and relatively expensive to manufacture. Further, these devices are generally heavy and some what limited in the elevation extension, and are also limited to a single beam.
Alternatively, continuous transverse stub (CTS) antennas are relatively flat, planar antennas that have relatively very thin profiles and are typically lightweight. Further, CTS antennas are generally durable, allow for dual-polarization, and are applicable at a relatively wide range of frequencies. Variable inclined continuous transverse stub (VICTS) antennas provide similar advantages as CTS antennas while providing the enhanced capability to steer the beam in elevation, allowing tracking and other benefits.
Still referring to
The second antenna 224 is positioned within a perimeter of the first antenna 222. Positioning the second antenna within the perimeter of the first antenna, at least in part, reduces the total size and footprint of the antenna system 220. In some embodiments, the first antenna is constructed with an inactive region 320 (see for example,
Further, the non-radiating conductors 330 can be configured in substantially any relevant configuration such that they are non-radiating and thus maintain the inactivity of the inactive region 320. For example, non-radiating matched delay conductors can be routed, wrapped and/or etched around the perimeter of the hole defining the inactive region 320. In some embodiments, the non-radiating conductors 330 are extended under the second antenna 224. Alternatively, the non-radiating conductors can be bundled and routed over the second antenna. Other configurations can also be employed to couple the two portions of the interrupted stubs.
Referring back to
A second antenna 524 is positioned at the inactive region 526, with the first antenna 522 surrounding the second antenna. Steering systems 530, 532 are cooperated with each antenna 522, 524, respectively, to implement the steering of the antenna to achieve desired communication. Each steering system includes a steering controller 534 and 536. In some embodiments, a single controller directs the steering systems 530, 532 for each antenna. The steering systems further include mechanisms 540 for implementing changes to antenna characteristics to achieve the desired steering. In some embodiments, the steering mechanisms 540 include rotation drives (such as motor driven rods, drive shafts, and/or gears), electrical coupling for electronically controlling, and/or other such mechanisms and combinations thereof that cooperate with the antennas to implement the desired change(s) to antenna characteristics. The steering mechanisms provide electromechanical steering and/or electrical steering.
In some embodiments, the antennas 522, 524 are controlled by adjusting one or more of an azimuth and/or an elevation at which the antenna is directed. Additionally and/or alternatively, the antennas can be adjusted to transmit and/or receive according to a desired polarization. Some preferred embodiments adjust one or more of the characteristics of the antenna through rotation of the antenna and/or portions of the antenna.
Similarly, a first steering system 530 cooperates with the first antenna 522. The first steering system can include a steering mechanism 540, such as a gear assembly or wheel, that couples with the perimeter 622 of the first antenna 522. The first steering system controller 534 controls the steering mechanism 540, for example, to rotation of the mechanism causing at least a portion of the first antenna to rotate adjusting a desired characteristic of the first antenna. One or more power and signal control units 628 couple with the first and second antennas to supply power to the antennas, to forward signals to be transmitted and/or retrieve signals received through the first and second antennas 522, 524.
Still referring to
In some embodiments, the second antenna can similarly be configured with a turntable 650, an elevation plane 652, and/or a polarization plane 654. The second steering system 532 can also include, in some implementations, a separate steering mechanism (e.g., rotational drives, gears, and/or other mechanisms) for each plane (e.g., the turntable 650, elevation plane 652 and polarization plane 654), each controlled by the steering controller 536 to adjust the second antenna for a desired communication. The communication system 520 allows for independent steering of the first and second antennas 522 and 524, respectively, through the independent steering systems 530, 532 and steering mechanisms 540.
A first steering system 530 includes steering mechanisms 540, such as rotational drives. The steering mechanisms cooperate with the perimeter 825 of the first antenna 822 to rotate at least a portion of the first antenna about a Z axis. A first steering system controller 534 controls the rotation of the steering mechanism to rotate the first antenna to achieve the desired direction of transmission and/or reception, and/or polarization. Typically, more than one steering mechanisms 540 are employed to adjust different antenna characteristics. For example, the communication system 820 can include three steering mechanisms, one to control the positioning of a turntable 640, one to control an elevation plane 642, and one to control a polarization plane 644.
The second antenna 824 also includes multiple planes, such as a turntable 650, an elevation plane 652, and/or a polarization plane 654. In the communication system 820 of
The extension 840 is extended from the outer edge 828 of the second antenna 824 radially to define an outer perimeter or steering edge 842 that is proximate the perimeter 825 of the first antenna 822. This allows the steering system 532 for the second antenna to also be positioned outside the perimeter of the antennas 822, 824. Therefore, the first and second antennas do not have to be placed over the rotational drives, allowing, in some embodiments, for a lower profile 850 for the overall antenna system 820.
The first antenna 822 may include a small hole 860 to allow wiring or other electrical coupling of signals and power to be communicated to and/or from the second antenna 824. The power and/or signals for the first and second antennas 822, 824 are concentrically feed, in some implementations, to the first and second antennas through a single bearing in the center, or at a single swivel joint which may pass multiple signals and power supply lines at the center from a signal controller 870.
The second steering system 532 also can include separate steering mechanisms 540 (e.g., rotational drives, and/or other mechanisms) for each plane (i.e., the turntable 650, elevation plane 652 and polarization plane 654). The steering mechanisms 540 cooperate with the perimeter of the second antenna defined by the outer edge 842 of the extension ring(s). By using the outer perimeter 842 of the second antenna, the steering system 532, in some embodiments, achieves higher accuracy because of the increased circumference of the second antenna allows for smaller rotational changes of the second antenna relative to the angle of rotation of the rotational drive. The steering system 532 rotates the planes of the second antenna to accurately direct the second antenna to transmit and/or receive a beam in a desired direction, and in some implementations with a defined polarization. The communication system 820 allows for independent steering of the first antenna 822 and second antenna 824, through the independent steering systems 530, 532 and steering mechanisms 540.
In some implementations, the first and second antennas 922 and 924 include holes or apertures that at least in part define the inactive regions. Steering mechanisms cooperate with the second and third antennas through the holes of the first and second antennas, respectively. Similarly, power and communication signals can couple with the second and third antennas through the holes in the first and second antennas. In some embodiments, the third antenna provides bidirectional communication, while the first antenna transits wireless communication and the second antenna receives wireless communication. The antennas can be implemented in alternative configurations to achieve desired communications (e.g., first, second and third antennas each provide bidirectional communication; first antenna provided bidirectional communication, while second antenna transmits and third antenna receives; four concentric antennas can be employed; and substantially any relevant configuration). The size of the antenna system 920 and the antennas 922, 924, and 926 can be substantially any relevant size, depending on the desired implementation and/or communication to be achieved. Further, the antenna system 920 can include substantially any number of cooperated antennas.
In some embodiments, the off center positioning of the second antenna 1020, at least in part, allows the steering of the second antenna to be controlled through one or more steering mechanisms 1032 positioned at the perimeter of both of the first and second antennas without the steering mechanism being extended through a hole of the first antenna, and without employing extension rings to increase the diameter of the second antenna. This configuration further allows for a lower profile over systems positioning the steering mechanism under the first antenna 1022 and/or second antenna 1020. In some embodiments, the second antenna 1020 and the steering mechanism(s) 1032 of the second antenna are positioned directly on the first antenna, such as directly on a turntable 1018 of the first antenna. One or more steering mechanisms 1034 can cooperate with the first antenna, including the turntable 1018 to adjust antenna characteristics. As the turntable of the first antenna rotates, the second antenna and the steering mechanism 1032 also rotate, allowing the steering mechanism to continue to independently steer the second antenna. In some implementations, the second antenna can be positioned such that a portion of the antenna extends beyond the perimeter of the first antenna.
The present embodiments have been described as allowing for control and/or adjustment of the polarization of the wirelessly communicated beams and/or received beams. The polarization is employed in some implementations with linear polarization.
In some embodiments, each beam is divided according to a first and second linear polarization, according to partial elements, such as semicircular elements. Therefore, the antennas can be configured such that each beam is divided into two polarizations, where typically the polarizations are not independently steerable. The system of
In some alternative embodiments, however, one or both of the antennas can be circularly polarized. With circularly polarized antennas, the steering system does not include a steering mechanism to rotation the polarization layer as the circular polarization typically does not need alignment. The antenna system can be implemented as a concentric and/or eccentric horizontal and vertical ring pair, each with a singular polarization. There are many applications where the compound antenna systems of the present embodiments are employed with one or more antennas being circularly polarized, for example, operations in the Ka band for both their data and television solutions. The present embodiments allow dual antenna systems to operate with both antennas utilizing circular polarization; one to be operating with circular polarization while the other operates in linear polarization; and both to be operating in linear polarization.
The second antenna 1322 is an antenna steerable in elevation, and is implemented through substantially any such type of antenna, including as a tiltable flat panel antenna, a Lumberg lens based antenna, one or more small parabolic dishes, another VICTS type antenna, or other such antennas capable of being steered in elevation. The second antenna includes a tilt table 1334 allowing adjustment of the elevation of the second antenna through the tilt of the tilt table.
Both first and second antennas 1320, 1322 operate with the azimuth established through the rotation of the main turntable 1312. In some embodiments, the azimuth of the first VICTS antenna 1320 is further controlled through additional rotation of its own turntable. As indicated above, the elevation of the second antenna 1322 is controlled through adjustments to the tilt of the tilt table 1334, or by movement of a component of the Lumberg antenna feed, or by relative rotation of plates in a VICTS antenna. The adjustments for elevation for the first antenna 1320 are achieved through the rotation of its elevation plane through conventional means (e.g., through rotation of the elevation plane by steering control system 1330). The system 1310 is shown in
The communication system 1310 of
The present embodiments provide for low profile antenna communication systems allowing for multiple independently steerable beams. Because of the low profile, these antenna systems can be employed in numerous implementations. For example, the low profile antenna systems of the present embodiments can be utilized on airplanes to provide direct communication with satellites and/or other stationary or mobile communication platforms. By allowing independent steering of the antennas, the systems allow for simultaneous communication with multiple satellites or other communication stations.
Referring back to
Additionally, the systems can be scaled to substantially any size depending on the desired application. In some implementations, the communication systems of the present embodiments can replace existing antenna systems employed on some airplanes of commercial airlines, military airplanes and/or private airplanes. For example, an antenna system according to some embodiments can have dimensions for a first, larger antenna with a diameter of about 35 inches. In this configuration, the multi-antenna system can provide independent communication through each antenna, for example, providing transmission and reception of data (e.g., Internet, email, other electronic information, including operating conditions of the airplane and/or passengers) through a first antenna, and receiving and transmitting multimedia content and/or control data (e.g., “Live TV” content, television broadcasts, radio broadcasts, news broadcasts, movies and other such multimedia data and/or controls) through a second antenna.
The communication systems of the present embodiments are not limited to airplanes, but can be employ with substantially any mobile device (such as a car, train, boat or other such mobile devices), and/or can be utilized for stationary communication. As discussed above, the antenna systems of the present embodiments can be scaled for desired applications, such as placements on cars, ships, boats, and other mobile platforms, and can additionally be utilized in station applications (e.g., providing wireless communication of data and/or multimedia content from offices, homes, stadiums, and other facilities). Similarly, the communication systems can communicate with substantially any mobile communication station (e.g., satellites, other airplanes, cars, boats and other similar stations) and/or stationary stations 120 (e.g., ground airport communication stations, stationary dish antennas, other ground stations and the like).
Further, the present embodiments can be employed for communication at substantially any relevant frequency. The antenna systems according to some embodiments can be configured to provide communication in traffic radar frequency bands, military radar bands, international telecommunications union bands and other frequency bands. For example, in some implementations, the antenna systems provide communication over the Ka-band, the Ku-band, the L-band, the S-band and/or other such frequency bands.
While the invention herein disclosed has been described by means of specific embodiments and applications thereof, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope of the invention set forth in the claims.